Launched in March 1997, HIV InSite's mission is to be a source for comprehensive, in-depth HIV/AIDS information and knowledge. The site has an extensive collection of original material, including the HIV InSite Knowledge Base, a complete textbook with extensive references and related links organized by topic. Unlike many commercially oriented sites, HIV InSite's policy is to link to the best of the Web, and thousands of links to external Web sites are incorporated into the site's original content. It is the policy of HIV InSite to allow free, anonymous access to all of the site's content.